Correct description of duty cycle, Boe. You are hired.

ROAD/RACE
http://www.roadracemotorsports.com/

 

Boe, do you know someone running an RPW kit? Zlancer's is as much custom as it is RPW so far as I can tell. At the same psi the duty cycles would theoretically be the same because (assuming both use stock injectors and fuel pressure) they'd still be burning the same air and fuel. I don't think the fairly high duty cycle is kit specific. I think it's related to whether or not you change your stock injectors. Please correct me if I'm wrong, but that's my understanding of it.

Anyway, I guess you answered my question, but that leads to another one. Do you intend to up the boost or are you content where you are?

And more importantly, are we missing anything else for an answer for t-dot? My brain's siezed from running too high a duty cycle.

 

boeturbolancer

Yes you are correct, duty-cycle is the measured amount of time that the injectors are open in milliseconds- thousandths of secs. I guess the point that I was trying to get at is; if you are using a boost dependent regulator to meter the amount of fuel under boost, say at 8:1 ratio at 5psi your increasing the fuel pressure by 40psi. So this added to the stock pressure of say 43.5psi would now give you 83.5 psi at WOT, that is a huge increase in fuel pressure, without really inreasing the fuel flow rate. So what's my point?... I don't know!!! All I'm trying to say is that using a FMU to boost fuel is going to max out the injectors (stock) at anything more than 7psi of boost. So just be careful, because that's what happened to me I pushed my car to 11 psi just for 2 runs and cracked the pistons and rings.

oh yeah measuring the duty-cycle in the parking lot isn't going to cut it. But you already know this, no load on the engine sitting still.

 

Thanks for the support and comments... in the end i think all are a bit enlightened including me. As for my boost Rob and i have talked about the fuel pump and supply pressure in terms of max boost. We know that 300hp is about where the pump is at limits... considering at 5psi i'm at about 225-230/FW thus 7psi should be around 245-255FW. Long story short you want to leave a comfort zone so we agree 7psi non intercooled is about the max we want to go. By accident i ran a 9psi pull and fuel was fine along with some crazy pulling power. Don't know about intake temps but i believe they were in range. I said "believe not for sure" Another reason i'm at 7psi max right now. I'll keep everyone posted if i go up and give supporting facts. Also as soon as i get a dyno time i'll see about posting that. Again thanks to all and hope this help everyone out! MORE HP/TQ....GO BABY GO!!